package com.sky.aspect;


import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MemberSignature;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

//实现自动填充
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    //定义切面类的切入点

    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")//切点表达式
    public void autoFillPointCut(){}

    @Before("autoFillPointCut()")//前置通知
    public void autoFill(JoinPoint joinPoint){
        log.info("开始公共字段填充");
        // 获取操作类型       方法签名包含了方法的名称、返回值类型、参数类型等信息
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();//使用getSignature()方法获取连接点的方法签名信息
        AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class); //获得注解对象
        OperationType operationType = autoFill.value(); //获得数据库操作类型（如update

        //获得被拦截的方法里的参数：实体对象
        Object[] args = joinPoint.getArgs();
        if(args==null || args.length==0){return;}//方法没参数

        Object entity = args[0];

        //准备赋值数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //赋值数据
        if(operationType==OperationType.INSERT){
            //赋值4个
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod("setCreateTime", LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod("setCreateUser", Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
        else if (operationType==OperationType.UPDATE) {
            //赋值两个
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod("setUpdateTime", LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod("setUpdateUser", Long.class);

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                throw new RuntimeException(e);
            }

        }

    }

}
